Method for improving the high temperature strength of aluminum titanate ceramics

摘要

TECHNICAL FIELD The present invention relates to a catalyst support for automobiles, a filter for applied metals, a porous plug for ladle, and a method for enhancing the high temperature strength of aluminum titanate ceramics used as a refractory material. The YAG composition and silica are added as sintering aids The reliability of the aluminum titanate ceramics is improved by uniformizing the distribution of the amorphous YAG phase present in the crystal grain boundaries of the aluminum titanate and the amorphous YAG composition is subjected to the reheating treatment of the aluminum titanate ceramics to form the crystalline YAG phase with the aluminum titanate Temperature strength of aluminum titanate ceramics by increasing the high-temperature strength while suppressing the decomposition reaction of aluminum titanate.;In order to achieve the above object, the present invention provides a composite aluminum titanate powder having a molar ratio of alumina to titania of 1: 1 and a particle size of 3 m or less, extrapolating 1 to 10% by weight of a diatomic aluminum garnet composition and 0.5 to 3% And then sintering the aluminum titanate sintered body at a temperature in the range of 1500 to 1650C for 0.5 to 3 hours to prepare an aluminum titanate sintered body and then causing the amorphous diatomaceous earth aluminum garnet composition to be grain-The present invention relates to a method for improving the high temperature strength of aluminum titanate ceramics by reheating the aluminum titanate sintered body at a temperature range of 1250 to 1400C for 0.5 to 2 hours.